Read Oxygen carbon dioxide and nitrogen
This SOF ISO pattern tests identify atmospheric gases. Read the condition carefully, then use the method below before you solve.
Oxygen carbon dioxide and nitrogen is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Find the tested idea
Identify the material, change or observable property first; this decides the scientific rule to use.
Work from the evidence
Use the experiment or stated observation as evidence. Compare each option with the property, particle model or reaction condition in the stem.
Verify before choosing
Use the wording, diagram and units exactly as given. Select an option only after it satisfies every stated condition.
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- ✓State the observed property.
- ✓Select the governing idea.
- ✓Test every claim against the evidence.
Keep physical changes, chemical changes and everyday appearances separate.
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